In one of the first entries of the book, he writes from North Africa Nov 2, 1942:
"This mess is the best I have ever seen. I fear I shall get fat. I take lots of excersice each morning, including chinning myself and running in place four hundred and eighty steps (one quarter mile) in my cabin. In the morning, at battle stations, we put on rubber belts and tin hats, but as my battle station is my cabin, I don`t have to hurry. Then I go up on the flag bridge till it gets light and then have breakfast. Just finished reading the Koran - a good book and interesting.
Have been giving everyone a simplified directive of war. Use steamroller strategy; That is, make up your mind on course and direction of action, and stick to it. But in tactics, do not steamroller. Attack the weakness. Hold them by the nose and kick them by the pants."
Do you know why he admired the Koran? Because the Koran is a book of combat.